I think you may have been had by that dealer. If it had been heated, the rock would become more brittle and with repeated heating and cooling begin to appear more glass like and cracked. This looks like a concretion which has been rolled around on a beach or river and then been polished, presumably by hand giving that the stone is polished even on the inside of the small craters and imperfections of the rock. Sorry if this is a little disappointing but it is still an attractive object in my opinion - reminds me a little of the style of salt glazed stoneware.

I agree with the UK fossil guy- the dealer wasn't actually sure what it was. It is quite common when a dealer finds or buys something, and they just make it up what it is when they don't know, but by no means are all dealers like that.

Most dealers are genuine people, it is is just the odd few which con people. I buy loads of fossils. When you type in fossils for sale on google, the first 20 which come up are surtain to be genuine, and even the ones after that are probably genuine- it is just the odd few which con people.

Yeh, at least it was only Â£7. I once bought a spinosaurus tooth when I was about 3. At the shop, they said it was the complete tooth which didn't have any repairs, but now I am older I can tell it has 8 repairs, and the only real fossil part to it is a tiny piece of enamel. The rest of it is just man-made rock.

7 quid for it in my opinion was not a good price. I think when you bought it off the antiuqe dealer had had a rather expensive shop. It is always good to look at simular things on the internet and see how much they are before buying.